. FAQ_Shenzhen AOEYOO Technology Co., Ltd




1. How to solve the problem of flashing screen, black screen, or no display in the process of using?

1) Please check the use of network cable, it is recommended to use Cat6/6A/7 cable within 50 meters.

2) The black screen after connection may be that the wires don’t meet the transmission requirements. It is recommended to replace the wires with a better quality. Such as Full Cooper, Choseal.

3) Please check whether the HDMI cable is connected well. It is recommended to use an HDMI cable within 5 meters.

4) During the using process, please keep a distance of more than 1 meter from heavy current cable, radio, mobile phone, etc., to prevent electromagnetic interference.


2. When is video signal distribution needed?

Signal distribution is needed when one or more signals are to be received at several acceptors. Some examples - in a duplication studio where many copies are made from one master, in shops and at points of sale for advertising and promotion, in railway stations and airports for time and route announcement and in many other applications. In the CCTV and security field several guards may need to control the same scene on several monitors, and in educational applications, pupils in several classrooms may watch one video signal. The main object is to achieve the highest signal quality and equal outputs at each acceptor. In order to achieve high quality distributed video signals a distribution amplifier is needed. The video (and, if necessary, the audio) source is connected to the input(s) of the video distributor, and the outputs of the distributor are connected to the video acceptors.

High quality cable and connectors should be used throughout. This setup is good for short distances between source, amplifier and acceptors of up to 15meters.


3. How to send a video signal over very long distances (hundreds of meters and more)?

In order to transmit a video signal over a very long distance, three options are available: The twisted pair solution. The fiber optic solution. The RF / Microwave solution. Each solution has advantages and disadvantages, and the user should check and weigh them for his needs: The twisted pair solution: The advantages of the twisted pair solution are simplicity and very low cost. All that is needed is a twisted pair transmitter, a twisted pair receiver and twisted pair wire of the requisite length. When using a good quality system, this solution can transmit video (and sometimes audio signals as well) over distances ranging from 300 meters up to 1 km. Black and white video (for security) can be transmitted up to 3 km using this system. The main disadvantages are fairly quick deterioration of signal quality with distance, and susceptibility to electromagnetic and electrostatic damage (lightning, strong electromagnetic fields, etc.) The Fiber optic solution: Like the twisted pair solution, the fiber optic system consists of a transmitter, receiver and optical fiber of the appropriate length. Fiber optics allows transmitting video signals over distances from 5 km up to 50 km. Signal quality is maintained much better than with the twisted pair solution, and the signal is not susceptible to external interference. The drawbacks of this system are the price, mainly of the optic fiber, and the excessive sensitivity of the plugs and connectors (if a firm attachment of the connector is not assured the signal deteriorates rapidly.) The RF / Microwave solution: This solution has longest distance of transmission. The equipment involved is complicated and expensive - modulators, converters, transmitters, receivers, headends, downconverters and demodulators. The received signal quality is excellent, but the price of good equipment is very high. With appropriate relays and satellite use, the range is practically unlimited. The user should choose the right system for his needs, taking in consideration future expansion and his budget.


4. What is RS-232 control?

RS-232 control is a way of remotely controlling a video device (Switcher, SEG, etc.) by using a personal computer with a serial port, or another device that uses a similar communication protocol. The simplest connection between an RS-232 controller and a controlled device uses two wires (TRANSMIT, RECEIVE) and a common ground wire.


5. How to extend a video-audio matrix switcher?

Adding inputs, outputs or both may extend a matrix switcher. In order to add OUTPUTS to a matrix setup, a second switcher is added, and the inputs of both matrices are connected in parallel (while assuring proper input termination, to avoid double termination). In order to add INPUTS to an existing matrix, a second matrix is connected - paralleling the outputs of both machines. When a matrix is to be extended in both directions, both INPUTS and OUTPUTS are paralleled, requiring four or more machines. A matrix can be extended only if it is designed as an extendable matrix, e.g., inputs must be looping and outputs must be able to be internally disconnected or become “floating”.


6. How to remote control a switcher?

A switcher may be remote controlled with wires or by a wireless remote controller. The wires may be either connected in parallel to the existing control switches (if allowed by the design) or using the RS-232 or RS-422 control option provided by the machine. Wireless remote control usually employs an IR (infrared) transmitting-receiving system, similar to the systems available for home remote control (TV, VCR etc.)


7. What’s the difference between a video switcher and a matrix?

The word SWITCHER is also sometimes used to describe a video mixer or SEG. We will use it exactly as the name indicates. A video switcher usually switches from several sources to one acceptor, having many inputs (4, 8, 16, etc.) and one output, therefore, only one crosspoint is active at any given moment. Video switchers may be of the electronic or mechanic type. A Video Matrix, on the other hand, has multiple inputs and outputs, allowing simultaneous connection between several sources and acceptors, and may be used as a DA as well. Matrices are usually of the active electronic type, having many crosspoints.




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